<!DOCTYPE html>
<p>There should be two identical blue squares below.</p>
<div style="columns:3; column-gap:10px; width:350px; line-height:20px;">
    <div style="break-after:column;"><br></div>
    <div style="padding:10px 0; background:blue;">
        <div>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
        </div>
    </div>
</div>
